金属螯合类芬顿催化剂的制备及对四环素的降解

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Abstract A solid-phase iron-based chelating Fenton-like catalyst was synthesized by grafting the chelating ligand amino carboxylic acid onto dopamine, followed by chelation with a metal. Experimental studies using H₂O₂ as the oxidant for the catalytic degradation of antibiotics revealed that the system could effectively remove tetracycline, achieving over 87% removal within a pH range of 3 to 10, with a maximum efficiency of 95.02%. The system maintained an impressive removal efficiency of 86.47% for tetracycline even after seven rounds of reuse. Despite the presence of anions such as Cl^-, NO₃^-, HCO₃^-, SO₄^2-, and HPO₄^2-, and in various water matrices including ultrapure water, tap water, river water, and lake water, the catalytic degradation system consistently delivered favourable outcomes. Liquid chromatography-mass spectrometry (LC-MS) and biological toxicity assessments disclosed that the degradation of tetracycline occurred through three distinct pathways, where the toxicity of the intermediate products initially increased before decreasing to nontoxic and harmless levels. This catalyst preparation strategy was further extended to develop cobalt-based catalysts, which exhibited a remarkable 98.52% removal efficiency for tetracycline within a 10minute reaction period when using peroxymonosulfate (PMS) as the oxidant.

Key words： chelation Fenton-like tetracycline dopamine amino carboxylic acid

Received: 13 October 2023

PACS:

X703.1

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	LI Xing-fa
	LIN Jia-wei
	ZHEN Xiao-xiao

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LI Xing-fa,LIN Jia-wei,ZHEN Xiao-xiao. Preparation of metal chelated Fenton-like catalysts used for tetracycline degradation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(5): 2704-2713.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I5/2704

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